CRUCIFER^E 17 



with yellow flowers, and auricled pinnatifid leaves with 

 linear segments, grows on dry mountain-sides in Switzer- 

 land. The other Swiss species are also English, and 

 are aquatic or moisture-loving plants of the lowlands, 

 viz. : N. officinale } Br., Watercress, with white flowers ; 

 and N. sylvestre, Br. ; palustre, DC. ; and amphibium, 

 Br. ; all with small yellow flowers. 





4. BARBAREA, Br. 



Stigma terminal ; flowers yellow; sepals equal; petals 

 clawed ; seed-vessel 4-angled ; seeds in one row. Not 

 alpine. 



B. vulgaris, R.Br., Winter Cress, with its sub-species, 

 is a very common hedgerow plant. 



5. ARABIS, L. 



Stigma terminal; flowers usually white; seed-vessel 

 linear, compressed ; seeds in one row. 



A. Flowers blue: A. ccerulea, Haenke; a very 

 pretty plant of the High Alps and Dauphiny, with pale 

 blue flowers and long erect seed-vessels. 



B. Flowers pale yellow; stem-leaves amplexicaul, 

 auricled: A. perfoliata } Link (Turritis glabra, L.) ; 

 plant nearly glabrous, stem-leaves sagittate, seeds not 

 winged ; stony places. A . Turrita, L. ; plant pubescent, 

 seeds winged ; stony places. 



C. Flowers cream-coloured : A. stricta, Huds. ; leaves 

 thick, shining, stem-leaves not amplexicaul ; Saleve, 

 Dauphiny, Pyrenees. 



D. Flowers pink or lilac: A. arenosa, Scop.; calyx 

 VOL. I. B 



